15-relatividade-restrita-usp

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    PKCOXDYDHOHK PKUXPDXO~fp

    Pf`kpxf@obdluad@oxduxoUolxfu

    Ephdxfu ho ykpuf dm~pkuuo7

    Khdxfpof Kckxpldeo# Idb{pou k Dc{uxpokuDykxk E, F~~kljkdm

    Mopdo hk Cf{phku Mfpodu

    Dm~pkuuf7Bpideo hf Dlux, hk Iudeo - [U^?o Dm~pkuuf - ?4440o Dm~pkuuf *efm xkzxf pkyduohf$ - 0>>>5o Dm~pkuuf *pkyduoho$ - 0>>?8o Dm~pkuuf - 0>>0

    Ephdxfu ho ykpuf kckxpldeo7

    Khdxfpof Kckxpldeo k Xpoxomklxf hk Dmobklu^o{cf Pkloxf Cfiipkhf

    PkydufFcbo Pobo hf Eom~f

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    U{mpdfDlxpfh{f,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,??, PKCOXDYDHOHK HK BOCDCK[,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,00, O YDHO KM MKDF OF XKP,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,85,? F KZ^KPDMKLXF HK MDEJKCUFL - MFPCKT,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,;5,0 O@KPPOF HO C[W KUXKCOP,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,:5,5 EFLXPOF HK EFM^PDMKLXF HK CFPKLXW - IDXWBKPOCH,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,4

    5,8 HDCOXOF HF XKM^F,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,?>8,? ^FUX[COHFU HO PKCOXDYDHOHK HK KDLUXKDL,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,?08,0 UDM[CXOLKDHOHK,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,?58,5 EFMF EFLUXP[DP [M UDUXKMO HK PKIKPLEDO,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,?88,8 XPOLUIFPMOKU HK CFPKLXW,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,?98,; EFLXPOF HK EFM^PDMKLXF HK CFPKLXW-IDXWBKPOCH,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,0?8,9 HDCOXOF HF XKM^F,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,058,2 O CFLBO YDHO HF MUFL ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,098,: O@KPPOF PKCOXDYUXDEO HO C[W KUXKCOP,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,028,4 KIKDXF HF^^CKP,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,0:8,?> ^OPOHFZF HO EFLXPOF HF EFM^PDMKLXF6,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,5>8,?? ^OPOHFZF HFU BMKFU6,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,508,?0 EO[UOCDHOHK K DLYKPUF HO FPHKM XKM^FPOC HFU KYKLXFU,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,50

    8,?5 OHDF HK YKCFEDHOHKU,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,58;,? MFMKLXF CDLKOP,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,59;,0 O 0 CKD HK LKRXFL,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,5:;,5 KLKPBDO,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,54;,8 EFCDUF DLKCUXDEO7 [M KZKM^CF HO EFLYKPUF HK KLKPBDO KM MOUUO,,,,,,,,,,,,,,,80;,; XPU DHKLXDHOHKU XKDU,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,80;,9 ^OPXE[COU HK MOUUO L[CO,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,85;,2 [LDHOHKU,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,88;,: UDUXKMOU CDBOHFU,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,8;9, CKDX[PO OHDEDFLOC,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,82Obpohkedmklxfu,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,8:

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    Dlxpfh{f

    Lf idloc hf ue{cf ZDZ fu ~pf ckmou i{lhomklxodu ho iudeo ~opkedom

    pkufcydhfu7 o mkeldeo k o bpoydxof hk Lkrxfl pkbdom f mfydmklxf hfu efp~fu

    ekckuxku k xkppkuxpku# fu iklmklfu kcxpdefu# moblxdefu k ~xdefu kuxoyom

    {ldideohfu uf` f kckxpfmoblkxdumf hk Mozrkcc# o xkpmfhdlmdeo kpo# km `fo ~opxk#

    pku~fluykc ~kco kz~oluf dlh{uxpdoc ho ~feo, ^opkedo g{uxf ku~kpop q{k ou

    ~kq{klou l{yklu yduykdu lf jfpdwflxk kuxdykuukm cfbf hduud~ohou, Ikcdwmklxk# xoc

    kz~kexoxdyo lf ifd uoxduikdxo,

    Eoho ~kq{klo l{ykm hkuklyfcyk{-uk km ~fhkpfuo xfpmklxo k o~u {m q{opxf

    hk ue{cf f ~olfpomo ho iudeo kuxoyo pohdeocmklxk ocxkpohf,

    [mo lfyo eflek~f# o mkeldeo q{lxdeo# hkuyklhoyo fu

    ukbpkhfu mdepfue~defu ho moxpdo k hou dlxkpoku k oxmkumf lfuuou lfku hk ku~of k hk xkm~f xdykpom hk ukp

    ~pfi{lhomklxk mfhdideohou# dldedocmklxk ~kco pkcoxdydhohk hk

    Kdluxkdl k km ukb{dho ~fp u{o bpoydxof,

    O pkcoxdydhohk hk Kdluxkdl ~pky ocb{lu iklmklfu

    e{pdfufu7 {mo `oppo hk efm~pdmklxf > xkp uk{

    efm~pdmklxf pkh{wdhf ~opo =? y0 &e0 > q{olhf kuxdykp km mfydmklxf efm

    ykcfedhohk y 3 e *e o ykcfedhohk hk ~pf~obof ho c{w lf ye{f$1 fu pkcbdfu pkh{wkm

    uk{ ~ouuf k f dlxkpyocf hk xkm~f x> hkmfpo {m dlxkpyocf hk xkm~f

    x=x> &?y0 & e0 uk f pkcbdf kuxdykp km mfydmklxf1 q{olhf {m f`gkxf hk mouuo m>

    kuxdykp km mfydmklxf u{o mouuo o{mklxop ~opo m=m> &?y0 & e0 k ~fhkp ukp

    eflykpxdho lou modu yopdohou ifpmou hk klkpbdo *K = m e0$, Xfhfu kuuku iklmklfu

    ifpom ykpdideohfu kz~kpdmklxocmklxk of cflbf hfu olfu k o~kuop ho hkueflidolo

    efm q{k o pkcoxdydhohk hk Kdluxkdl ifd dldedocmklxk pkek`dho km ?4>; ~fhkmfu hdwkp#jfgk km hdo# q{k ~f{eou xkfpdou iudeou uf`pkydykpom xf `km q{olxf o pkcoxdydhohk ofu

    kzo{uxdyfu xkuxku o q{k ifd u{`mkxdho,

    Kuxou lfxou hkykm ifplkekp {mo `pkyk dlxpfh{f pkcoxdydhohk hk Kdluxkdl k

    o~pkuklxom moxkpdoc `udef# dhklxdideohf ~kco ckxpo O, mopbkm ho ~bdlo#

    efm~ckmklxohf ~fp ~kq{klou hkmfluxpoku# o~cdeoku k kzxkluku dhklxdideohou

    ~kco ckxpo @, Oyklx{pk-uk,

    ?

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    ?, PKCOXDYDHOHK HK BOCDCK[

    _{olhf ho ~{ cdeof hfu "^jdcfuf~jdok Lox{pocdu ^pdled~do Moxjkmoxdeo"

    *^pdle~dfu Moxkmxdefu ho Idcfufido Lox{poc$ km ?9:2 Duooe Lkrxfl xfplf{ ~`cdeou

    u{ou xpu ckdu hk mfydmklxf7

    D, [m efp~f ~kpmolkek km pk~f{uf f{ km mfydmklxf pkxdclkf {ldifpmk o mklfu

    q{k {mo ifpo ox{k uf`pk ud1

    DD, [m efp~f q{k ufipk o ofhk {mo ifpo mfyk-uk hk mfhf xoc q{k o xozo hk

    yopdof xkm~fpoc hf mfmklxf cdlkop ukgo db{oc ifpo1

    DDD, Uk hfdu efp~fu kzkpekpkm ifpou {m uf`pk f{xpf kuxou ukpf db{odu km

    mobldx{hk k f~fuxou km uklxdhf,

    O ~pdmkdpo hkuxou ckdu# o Ckd ho Dlpedo f{ f ^pdled~df

    ho Dlpedo# xkm u{o o{xfpdo oxpd`{ho o Bocdck{ Bocdckd k

    kuxo`kckek q{k eouf lklj{mo ifpo ox{k uf`pk {m efp~f

    kuxk ~kpmolkekp km uk{ kuxohf hk mfydmklxf *pk~f{uf

    f{ mfydmklxf pkxdclkf {ldifpmk$ mou cedxf ~kpb{lxop#

    pk~f{uf f{ mfydmklxf pkxdclkf {ldifpmk km pkcof o

    q{6

    Lkrxfl oidpmo# efmf pku~fuxo ~kpb{lxo# pk~f{uf f{

    mfydmklxf pkxdclkf {ldifpmk km pkcof of Ku~of

    O`ufc{xf# of q{oc kux ouufedohf f Xkm~f O`ufc{xf, F Ku~of k f Xkm~f O`ufc{xf

    xom`m kpom ejomohfu hk Ku~of k Xkm~f O`ufc{xfu k Ykphohkdpfu, Ukpdo

    ~fuuykc hkxkexop lfuuf kuxohf hk mfydmklxf o`ufc{xf km pkcof of Ku~of k of

    Xkm~f O`ufc{xfu6

    Bocdck{# ocb{lu olfu olxku hk Lkrxfl# g joydo mfuxpohf q{k lf ukpdo ~fuuykc

    hduxdlb{dp# ~fp q{ocq{kp mkdf mkeldef# klxpk {m mfydmklxf pkxdclkf {ldifpmk km

    pkcof ofu Ku~of k Xkm~f O`ufc{xfu k f{xpf mfydmklxf pkxdclkf {ldifpmk km

    pkcof o {m uduxkmo hk pkikpledo q{k kzke{xo# xom`m# ocb{m mfydmklxfpkxdclkf {ldifpmk km pkcof ofu Ku~of k Xkm~f O`ufc{xfu', Km ~opxde{cop#

    pk~f{uf o`ufc{xf ukpdo f`ukpyohf efmf mfydmklxf pkxdclkf {ldifpmk km pkcof o

    q{ocq{kp uduxkmo hk pkikpledo q{k kuxkgo# ~fp u{o ykw# km mfydmklxf pkxdclkf

    {ldifpmk km pkcof ofu Ku~of k Xkm~f O`ufc{xfu, Ouudm# {m mopdljkdpf q{k

    kuxdykuuk eflidlohf o {mo eo`dlk ukm golkcou k q{k hkedhduuk pkocdwop {mo updk hk

    ' [m uduxkmo hk pkikpledo q{k kzke{xo {m mfydmklxf pkxdclkf {ldifpmk km pkcof of Ku~of k of Xkm~f O`ufc{xfu lfuf modu lkekuupdou *~fp f`po k bpoo ho pkcoxdydhohk hk Kdluxkdl$ hdwkmfu# eflxkm~fpolkomklxk q{k {m uduxkmo

    dlkpedoc hk pkikpledo {m km q{k yock f ^pdle~df ho Dlpedo hk Bocdck{# f{ ukgo# {m efp~f q{k lf kuxdykp u{gkdxf oq{ocq{kp ifpo kuxop km pk~f{uf f{ km mfydmklxf pkxdclkf {ldifpmk km pkcof o {m pkikpkledoc dlkpedoc, Kl{ledohohkuuo molkdpo# o lff hk uduxkmo dlkpedoc hk pkikpledo ~opkek {m xolxf xo{xfcbdeo mou ohq{dpk bpolhk uklxdhff~kpoedfloc o ~opxdp hf mfmklxf km q{k ufmfu eo~owku hk dhklxdideop ou ~fuuykdu eo{uou hk ifpou k lk{xpocdw-cou, Okuuk pku~kdxf yock o ~klo eflu{cxop J, M, L{uuklwykdb# "Mkeldeo *E{puf hk Iudeo @udeo# Yfc, ?$# eo~, 8,

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    kz~kpdledou mkeldeou efmf# ~fp kzkm~cf# olhop# uocxop# hkdzop eodp f`gkxfu f{

    oppkmkuu-cfu km q{ocq{kp hdpkf q{k cjk obpohouuk# f`ukpyop f mfydmklxf hk

    ~lh{cfu f{ hk mouuou ~pkuou o mfcou uf`pk {mo mkuo f{ ~klhklxku hf xkxf ho

    eo`dlk# oxdpop {mo `fco hk `dcjop eflxpo o ~opkhk ho eo`dlk f{ eflxpo f{xpo `fco hk

    `dcjop f{ pkocdwop q{ocq{kp f{xpo kz~kpdledo mkeldeo efm f f`gkxdyf hk hkxkpmdlop

    uk f loydf kux km pk~f{uf f{ km mfydmklxf pkxdclkf {ldifpmk km pkcof ofuKu~of k Xkm~f O`ufc{xfu f{ km pkcof o q{ocq{kp uduxkmo dlkpedoc hk

    pkikpledo ipoeouuopdo, O hku~kdxf ho klbkljfudhohk hk lfuuf mopdljkdpf f ioxf

    q{k kck gomodu eflukb{dp hkuef`pdp uk kux km mfydmklxf pkxdclkf {ldifpmk f{

    km pk~f{uf pkocdwolhf o~klou kz~kpdledou mkeldeou, ^pkeduolhf kuxo

    oidpmof# f ^pdle~df ho Pkcoxdydhohk Bocdckolo ~pf~k q{k ou ckdu q{k pkbkm f

    mfydmklxf hfu efp~fu ukgom ou mkumou km q{ocq{kp uduxkmo dlkpedoc hk pkikpledo,

    ^opo xfplop f ^pdle~df ho Pkcoxdydhohk Bocdckolo modu ~oc~ykc efludhkpk f

    eouf udm~cku hf mfydmklxf hk {m efp~f hk mouuo m efluxolxk uf` o of hk {mo

    ifpo I lf uduxkmo dlkpedoc U# q{k uk mfyk efm ykcfedhohk y =y d km pkcof

    of uduxkmo dlkpedoc U *ykp Idb, ?$, ^opo xfplop x{hf modu udm~cku u{~fpkmfu q{k fu

    kdzfu Fz k Fz# Ft k Ft# Fw k Fw uf ~opockcfu klxpk ud k q{k lf mfmklxf km

    q{k ou fpdbklu F k F efdledhdpom ou kueocou hk xkm~f ifpom udlepfldwohou km

    wkpf km om`fu fu uduxkmou, G uo`kmfu q{k {m kyklxfO q{k fefppk lf dluxolxk hk

    xkm~f x lou effphklohou *z# t# w$ hf uduxkmo dlkpedoc U ukp hkuepdxf# lf uduxkmo U#

    ~kcou effphklohou *z# t# w$ k ~kcf dluxolxk hk xkm~f x# q{k uk pkcoedflom efm

    uk{u eflblkpku hf uduxkmo U ~fp mkdf hou XPOLUIFPMOKU HK BOCDCK[7

    Ou efm~flklxku hf ykxfp ykcfedhohk{ " hf efp~f km pkcof of uduxkmo dlkpedoc

    U pkcoedflom-uk efm ou efm~flklxku ho

    ykcfedhohk { km pkcof o U ukb{lhf o CKD

    HK OHDF HK YKCFEDHOHKU BOCDCKOLO7

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    ^fp u{o ykw f ykxfp oekckpof o " km pkcof o U dhlxdef of ykxfp

    oekckpof o km pkcof o U, ^fpxolxf# o 0Ckd hk Lkrxfl# q{k km U ~fhk ukp

    kuepdxo efmf

    I "=m o " #

    xfplo-uk

    I =mo

    lf uduxkmo dlkpedoc U# yduxf q{k o mouuo o mkumo lfu hfdu uduxkmou dlkpedodu, Ou

    kq{oku *?,5$ k *?,8$ uf {m kzkm~cf hf q{k udbldideo hdwkp q{k ou ckdu hk mfydmklxf

    xm o mkumo ifpmo km q{ocq{kp uduxkmo dlkpedoc, Uk km U ~{hkpmfu kuepkykp

    I =m o

    km U ~fhkpkmfu kuepkykp

    I "=m o "

    k lklj{mo kz~kpdledo mkeldeo ukp eo~ow hk hduxdlb{dp klxpk pk~f{uf f{ mfydmklxf

    pkxdclkf {ldifpmk km pkcof ofu Ku~of k Xkm~f O`ufc{xfu, Hk ioxf# lklj{mo

    kz~kpdledo mkeldeo ukp eo~ow hk oxpd`{dp {m ~o~kc ku~kedoc o q{ocq{kp uduxkmo

    dlkpedoc k ou lfku hk Ku~of k Xkm~f O`ufc{xfu u ifpom pkuboxohou lf ue{cf ZDZ

    efm f ohyklxf hk {mo eflek~f {ldideoho ho ~xdeo# ho kckxpdedhohk k hf

    moblkxdumf# f kckxpfmoblkxdumf hk Mozrkcc,

    0, O YDHO KM MKDF OF XKP

    dm~fuuykc hkuef`pdp# ~fp q{ocq{kp mkdf mkeldef# uk kuxomfu km pk~f{uf f{

    km mfydmklxf pkxdclkf {ldifpmk km pkcof of Ku~of k of Xkm~f O`ufc{xfu,

    Kzduxkm# ~fpm# iklmklfu q{k lf uf hk lox{pkwo mkeldeo k ocb{lu hkuxku g kpom

    `km efljkedhfu lo ~feo hk Bocdck{ k hk Lkrxfl7 fu iklmklfu ~xdefu# kcxpdefu k

    moblxdefu,

    O xkfpdo ~xdeo hk Lkrxfl ~pf~{ljo q{k o c{w ifuuk efm~fuxo hk ~kq{klfuefp~ue{cfu k xklxoyo# hkuuk mfhf# kz~cdeop u{o ~pf~obof km cdljo pkxo, Lo Ipolo

    fu iudefu# uf` dlu~dpof ho xkfpdo hfu ypxdeku hk Hkueopxku# ~pf~{ljom q{k o c{w

    ifuuk {mo ifpmo hk hduxp`df eo~ow hk ~pf~obop-uk km ocb{m mkdf moxkpdoc efmf ou

    ~kq{klou flhou q{k uk ifpmom lo u{~kpiedk hk {m cobf,

    F xkuxk hkedudyf ydpdo o~klou lf ue{cf ZDZ mou m{dxf olxku hduxf Lkrxfl g joydo

    hkuef`kpxf f iklmklf hk dlxkpikpledo hk c{w# ioedcmklxk kz~cdeykc ~kco jd~xkuk

    ho lox{pkwo flh{coxpdo ho c{w# k u{bkpd{ q{k kpo lkekuupdf oxpd`{dp c{w ocb{mo

    ifpmo hk ~kpdfhdedhohk *oxpd`{xf lox{poc hk q{ocq{kp flho mou hk hdiedc

    dlefp~fpof xkfpdo efp~{ue{cop ho c{w1 lf ue{cf ZZ# km ~opxk bpoou o Kdluxkdl# f

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    oxpd`{xf hk ~kpdfhdedhohk ifd dlefp~fpohf xkfpdo efp~{ue{cop ho c{w k fu efp~ue{cfu

    hk c{w uf efljkedhfu efmf ixflu$',

    Odlho ouudm# efmf efm~pkklhkp o ~pf~obof km cdljo pkxo uklf ~kcf

    mfydmklxf hk efp~ue{cfu6 J{tbklu mfuxpf{ q{k kpo ~fuuykc k udm~cku klxklhkp

    o ~pf~obof ho c{w km cdljo pkxo {uolhf {m ~pdle~df hk efm~fudf hk flhou

    q{k ydpdo o xkp uk{ lfmk,Lf ue{cf ZDZ ou kydhledou kpom `ouxolxk ecopou7 c{w flho, Xfhoydo# xfho

    kz~kpdledo efm flhou ox klxf kzdbdo q{k ou flhou ifuukm ~pf~obohou km

    ocb{m mkdf moxkpdoc7 flhou uflfpou lf op# flhou hk b{o lo b{o# flhou kcuxdeou

    lfu modu hdykpufu mkdfu kcuxdefu, Kpo dleflek`ykc q{k o c{w lf uk ~pf~obouuk

    km {m mkdf moxkpdoc k udm lf yowdf, Kuxk mkdf moxkpdoc ifd ejomohf hk xkp k

    hkykpdo xkp ~pf~pdkhohku q{ouk eflxpohdxpdou, Hkykpdo ukp m{dxf pbdhf# ~opo q{k o

    ykcfedhohk hk ~pf~obof hf hduxp`df c{mdlfuf ifuuk ocxuudmo '' *0442408;: m&u$#

    mou xom`m hkykpdo ukp oppouxohf efm `odzuudmo pkuduxledo# ~opo lf dlxkpikpdp lf

    mfydmklxf ~colkxpdf# ~fp kzkm~cf, Of cflbf hf xkm~f fu iklmklfu kcxpdefu k

    moblxdefu ifpom uklhf oxpd`{hfu of xkp# q{k ifd uk xfplolhf eoho ykw modu

    kuxpoljf ~opo oefmfhop xfho o mdpohk hk ~pf~pdkhohku kcxpdeou# moblxdeou k

    ~xdeou, ^fp idm# km mkohfu hf ue{cf ZDZ# Gomku E, Mozrkcc eflukb{d{ ifpm{cop

    {mo xkfpdo q{k eflbpkboyo fu iklmklfu kcxpdefu# moblxdefu k ~xdefu# f

    kckxpfmoblkxdumf# efm `ouk km {mo xkfpdo hk xkp m{dxf ufiduxdeoho, ^f{efu olfu

    hk~fdu# f mkumf Mozrkcc u{bkpd{ q{k f kckxpfmoblkxdumf u{uxklxoyo-uk

    dlhk~klhklxkmklxk hf xkp# `ouxolhf ohmdxdp o kzduxledo hk eom~fu# kcxpdef k

    moblxdef# q{k ~{hkuukm ukp ~pf~obohfu lf ye{f, O dhdo lf ifd `km pkek`dho7

    lf kpo udm~cku oekdxop {mo mfhdideof xf ~pfi{lho lo yduf - hk - m{lhf

    Lkrxfldolo# q{k xolxf u{ekuuf g joydo xdhf# k o`olhflop o moxkpdocdwof hf

    Ku~of k hf Xkm~f O`ufc{xfu k Ykphohkdpfu# f xkp,

    5,? F KZ^KPDMKLXF HK MDEJKCUFL - MFPCKT

    Lf ue{cf ZDZ f kckxpfmoblkxdumf hk Mozrkcc {ldideopo fu iklmklfu kcxpdefu#

    moblxdefu k ~xdefu, O c{w kpo yduxo efmf {mo yd`pof effphkloho hk eom~fu

    kcxpdef k moblxdef oef~cohfu k ~pf~oboyo-uk km {m mkdf moxkpdoc ejomohf hk

    xkp# q{k kuxopdo km pk~f{uf o`ufc{xf km pkcof of Ku~of k of Xkm~f O`ufc{xfu

    ' [m pkcoxf oekuuykc hkuuk k hk f{xpfu ~flxfu kux km P, ^, Iktlmol# "_KH7 Xjk Uxpolbk Xjkfpt fi Cdbjx olh Moxxkp"#

    ^pdlekxfl [ldykpudxt ^pkuu *?4:;$,' 'O ykcfedhohk ho c{w k f ukb{lhf ~fhkm ukp mkhdhfu hk mfhf xf oe{pohf q{k# km ?4:5# o Eflikpledo Bkpoc hk ^kufuk Mkhdhou hkidld{ f mkxpf efmf uklhf db{oc hduxledo ~kpefppdho ~kco c{w lf ye{f km ? & 04442408;: hk {m ukb{lhf,O ~opxdp hk klxf o ykcfedhohk ho c{w ~ouuf{ o ukp kzoxomklxk 0442408;: m & u k ou kz~kpdledou ~opo mkh-co obfpohkuxdlom-uk o mkhdp f mkxpf,

    ;

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    hk Lkrxfl, [mo eflukqledo dm~pkuudflolxk hf

    kckxpfmoblkxdumf hk Mozrkcc o ~pkyduf hk q{k o c{w ukpdo

    ~pf~oboho ukm~pk efm o mkumo ykcfedhohk o hku~kdxf hf

    kuxohf hk mfydmklxf# km pkcof of xkp# hf uduxkmo dlkpedoc lf

    q{oc f`ukpyoho, Kuuo ~pkyduf hkupku~kdxoyoo Ckd hk Ohdf

    hk Ykcfedhohku hk Bocdck{# kq{oku *?,0$# k ~opo kydxop f eflicdxf ifd ~pf~fuxf q{k fkckxpfmoblkxdumf hk Mozrkcc ukpdo ycdhf o~klou lf uduxkmo hk pk~f{uf hf xkp# f

    Ku~of k f Xkm~f O`ufc{xfu# uklhf mfhdideohf lfu f{xpfu uduxkmou dlkpedodu, O

    eflec{uf ocyduuopkdpo7 `ouxo mkhdp o ykcfedhohk ho c{w ~opo

    hkuef`pdp lfuuo ykcfedhohk km pkcof of xkp,

    O xklxoxdyo modu iomfuo hk dhklxdideop lfuuf kuxohf hk

    mfydmklxf km pkcof of xkp ifd f kz~kpdmklxf eflh{wdhf ~fp

    Mdejkcufl k ~fp Mfpckt km ?::2, C{w ydlho ho iflxk I lo Idb, 0

    *km {m kz~kpdmklxf ~pydf eflh{wdhf ~fp Mdejkcufl km ?::? o

    iflxk hk c{w kuxoyo lo Xkppo# km ?::2 Mdejkcufl k Mfpckt

    {uopom c{w ufcop$ oxdlbk {m ku~kcjf ukmd-xpolu~opklxk# lf

    ~flxf ^# k uk~opoho km hfdu ikdzku q{k uk hdpdbkm ofu ku~kcjfu U? k U0 hk flhk

    uf pkickxdhfu hk yfcxo km hdpkf o ^ k ho ~opo f xkckue~df X lf q{oc uf

    f`ukpyohou ~fuuykdu ipolgou hk dlxkpikpledo klxpk o c{w q{k ifd ~opo U? k oq{kco

    q{k ifd ~opo U0, O kzduxledo hk ipolgou

    hk dlxkpikpledo kux hdpkxomklxk cdboho

    hdikpklo lf eomdljf ~kpefppdhf ~kco c{w

    lfu `pofu ^U?^ k ^U0^ hf

    dlxkpikpmkxpf, ^fp u{o ykw# hdikpklou

    lf eomdljf ho c{w ~fhkm ukp eo{uohou

    ~fp {mo hdikpklo lfu efm~pdmklxfu hfu

    `pofu hf dlxkpikpmkxpf f{ ~fp {mo

    hdikpklo lo ykcfedhohk ho c{w km eoho{m hfu `pofu,

    ^opo ukp modu ku~keidef# u{~fljo q{k f dlxkpikpmkxpf mfyo-uk# km pkcof

    of xkp# efm ykcfedhohk y lo hdpkf hf `pof ^U ?, Ouudm# lf eomdljf ^U? o c{w

    xkp ykcfedhohk e-y *e o ykcfedhohk ho c{w lf xkp$ k lo yfcxo *U ?^$ e!y k ckyop#

    ~opo ~kpefppkp f xpkejf ^U?^# {m dlxkpyocf hk xkm~f db{oc o

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    Efmf f `pof ^U0^ k ~kp~klhde{cop ykcfedhohk

    hf dlxkpikpmkxpf km pkcof of xkp# o Ckd hk Ohdf

    hk Ykcfedhohku hk Bocdck{ ~pky q{k o c{w ukp

    ~pf~oboho efm ykcfedhohk e, Odlho ouudm# ~pkeduf

    ckyop km eflxo f ioxf hk q{k f ku~kcjfukmdxpolu~opklxk ^ xkp-uk- mfydhf {mo hduxledo

    klq{olxf o c{w yod hk ^ o U0 k modu {mo hduxledo lo yfcxo hk U0 o ^ *Idb, 5$,

    Ykmfu q{k hohf ~fp

    ^opo q{k f xpkejf ^U0^ ukgo ~kpefppdhf ~kco c{w ukp ~pkeduf {m dlxkpyocf hk xkm~f

    O hdikpklo lf eomdljf ~kpefppdhf ~kco c{w km eoho `pof hf dlxkpikpmkxpf

    ukp

    m{dxf hdiedc efluxp{dp `pofu hk dlxkpikpmkxpf hk ?> mkxpfu hk efm~pdmklxf

    efm o lkekuupdo ~pkeduf, Ukpdo hkukgykc q{k fu ~o~du hk ? k hk 0 km *5,8$

    ifuukm udmxpdefu, ^opo duuf Mdejkcufl k Mfpckt bdpopom f o~opoxf# q{k kuxoyo km

    {mo ~khpo q{k ic{x{oyo uf`pk mkpepdf# ~fp 4> k fu ~o~du hk ? k 0 ifpom

    xpfeohfu7

    k

    Uk f efm~pdmklxf hk flho ho c{w q{k klxpo lf dlxkpikpmkxpf ifp # ofpfhopmfu f kz~kpdmklxf ~fp 4> f ~ohpf hk dlxkpikpledo ukp hkucfeohf hk l

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  • 8/4/2019 15-relatividade-restrita-usp

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    ipolgou# efm

    ~fdu y & e 33 ? lfu kz~kpdmklxfu hk Mdejkcufl k Mfpckt, Lo kz~kpdledo hk ?::2 o

    c{w {uoho lf dlxkpikpmkxpf kpo omopkco 9#> z ?>2m k fu `pofu hf

    dlxkpikpmkxpf ~fuu{om# o~pfzdmohomklxk# ?? m eoho, Uk y ifuuk

    o~pfzdmohomklxk db{oc ykcfedhohk fp`dxoc ho Xkppo# 5> am&u# f hkucfeomklxf hk

    ipolgou ukpdo hk >#8> ipolgou, Mdejkcufl k Mfpckt kpom kzmdfu dlxkpikpfmkxpduxou k

    o~kuop hk uk{ o~opoxf ~fhkp hkxkexop# ukm hdide{chohk# hkucfeomklxfu hk ;

    mdcudmfu hk ipolgo */$ f pku{cxohf ifd l{cf7

    lklj{m hkucfeomklxf ifd f`ukpyohf kMdejkcufl k Mfpckt ~{hkpom oidpmop q{k o

    ykcfedhohk ho Xkppo km pkcof of xkp kpo

    dlikpdfp o ?> am&u *Idb, 8$, Km f{xpou

    ~ocoypou# o ykcfedhohk ho c{w kpo o mkumo#

    xolxf lo Xkppo q{olxf lf xkp# k o Ckd hk

    Ohdf hk Ykcfedhohku hk Bocdck{ lkekuudxoyo

    hk efppkku# ~kcf mklfu q{olhf o~cdeoho

    o iklmklfu hk ocxou ykcfedhohku#

    efm~opykdu ho c{w,

    5,0 O@KPPOF HO C[W KUXKCOP

    [mo ifpmo hk kz~cdeop f pku{cxohf l{cf hf kz~kpdmklxf hk Mdejkcufl - Mfpckt kpo

    u{~fp q{k f xkp ifuuk cfeocmklxk oppouxohf ~kco Xkppo km uk{ mfydmklxf ~kcf

    ku~of, Lkuuk eouf f dlxkpikpmkxpf kuxopdo km pk~f{uf km pkcof of xkp cfeoc k

    ukpdo lox{poc ku~kpop q{k loho ifuuk hkxkexohf, Xfhoydo# uk o iflxk hk c{w kuxdykuuk

    cfeocdwoho ifpo ho Xkppo xoc kz~cdeof hkdzopdo hk yockp, Lo ykphohk# f efljkedhf

    iklmklf hk o`kppof ho c{w kuxkcop# ioedcmklxk kz~cdeohf km xkpmfu ho xkfpdo hf

    xkp# lf hkykpdo fefppkp uk f xkp ifuuk oppouxohf ~kco Xkppo,

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    Lo o`kppof ho c{w kuxkcop {m xkckue~df#

    efmf f ho Idb, ;# q{k xklxk f`ukpyop {mo

    kuxpkco lf wldxk# ~fp kzkm~cf# efmf o iflxk I

    lf hkyk ukp o~flxohf hdpkxomklxk ~opo o

    kuxpkco mou hkyk ukp ckykmklxk dlecdlohf lo

    hdpkf o~opklxk I ~opo efm~kluop f kikdxf hfoyolf ho Xkppo ~kcf xkp efm ykcfedhohk y,

    ^fhk-uk mfuxpop q{k f lb{cf hk dlecdlof

    hkyk ukp hohf ~fp

    = opexb*y&e$ 0>#;"# *5,:$ ~opo y 5>am & u, Kuuk pku{cxohf kux km kzekcklxk

    oefphf efm o f`ukpyof ouxpflmdeo hk @pohckt *G, @pohckt# ^jdc, Xpolu, Pft, Ufe,#

    952 *?20:$1 ykgo xom`m Adxxkc# Aldbjx# P{hkpmol# "Mkeldeo" *E{puf hk Iudeo hk@kpakckt# Yfc, ?# Eo~, ?>$,

    5,5 EFLXPOF HK EFM^PDMKLXF HK CFPKLXW - IDXWBKPOCH

    Cfpklxw k IdxwBkpoch ~pf~{ukpom q{k xfhf efp~f q{k

    kuxdykuuk km mfydmklxf ~kcf xkp efm ykcfedhohk y xkpdo u{o

    hdmkluf# lo hdpkf hf mfydmklxf# eflxpoho ~kcf ioxfp

    ?y0 & e0 , Ouudm# lf kz~kpdmklxf hk Mdejkcufl - Mfpckt ?

    hkyk ukp u{`uxdx{hf ~fp ?> ?y0 &e0 # uklhf ?

    > f

    efm~pdmklxf hf `pof ^U?^ hf dlxkpikpmkxpf q{olhf km

    pk~f{uf km pkcof of xkp, Efmf f f{xpf `pof hf

    dlxkpikpmkxpf ~kp~klhde{cop hdpkf hf mfydmklxf

    0 =0> k

    O~u pfxof hk 4> km xfhf o~opoxf#

    K lf j q{ocq{kp m{holo lf ~ohpf hk dlxkpikpledo *l = >$# eflifpmk

    f`ukpyohf kz~kpdmklxocmklxk, Xfhoydo# uk f kz~kpdmklxf ifp pk~kxdhf efm f{xpo

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  • 8/4/2019 15-relatividade-restrita-usp

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    ykcfedhohk y hf dlxkpikpmkxpf km pkcof of xkp f pku{cxohf ukp

    O~klou km ?409 Akllkht pkocdwf{ f kz~kpdmklxf *0? olfu o~u o ~{`cdeof

    ho pkcoxdydhohk hk Kdluxkdl$# u{~flhf q{k o ykcfedhohk hf dlxkpikpmkxpf km pkcof

    of xkp ifuuk hoho ~fp y= yX yP yU0 # efm yX o ykcfedhohk ho Xkppo km

    pkcof of Ufc# yP o ykcfedhohk hk pfxof ho Xkppo k yU o ykcfedhohk hf Ufc km

    pkcof u kuxpkcou hduxolxku, O eoho hfwk jfpou kuxo q{olxdhohk ocxkpoho ~fp

    k o eoho ukdu mkuku ~fp

    F kikdxf ~pkyduxf lf ifd f`ukpyohf mfuxpolhf q{k o jd~xkuk hk eflxpof

    hk Cfpklxw - IdxwBkpoch lf kpo efppkxo, Ykpkmfu# ~fpm# q{k j {mo eflxpof

    hk Cfpklxw - IdxwBkpoch lo pkcoxdydhohk hk Kdluxkdl, F q{k hkyk ideop ecopf q{k

    o eflxpof hk Cfpklxw - IdxwBkpoch lf # hk mfhf ocb{m# dlefppkxo1 dlefppkxou

    uf o xkfpdo hf xkp k# ~fuudykcmklxk# ou lfku hk Ku~of k Xkm~f O`ufc{xfu,

    5,8 HDCOXOF HF XKM^F

    O jd~xkuk hk eflxpof hf efm~pdmklxf hk {m f`gkxf km mfydmklxf km

    pkcof of xkp ~kpmdxd{ klxklhkp f pku{cxohf hf kz~kpdmklxf hk Mdejkcufl - Mfpckt

    ukm o`olhflop lkm o pkcoxdydhohk hk Bocdck{ lkm ou lfku hk xkp f{ hk Ku~of

    k Xkm~f O`ufc{xfu, Xfhoydo# f kckxpfmoblkxdumf hk Mozrkcc kuxoyo uklhf

    efluxolxkmklxk efppf`fpohf ~kcfu modu hdykpufu kz~kpdmklxfu k odlho lf uk

    og{uxoyo o pkcoxdydhohk hk Bocdck{,

    Ukb{lhf f kckxpfmoblkxdumf hk Mozrkcc o c{w kpo {mo ifpmo hk yd`pof

    kckxpfmoblxdeo pkbdho ~fp {mo kq{of hk flho ho ifpmo

    O i{lf pk~pkuklxo q{ocq{kp {mo hou efm~flklxku hfu ykxfpku hk eom~f

    kcxpdef K f{ moblxdef @ ho flho kckxpfmoblxdeo, F ^pdle~df ho Pkcoxdydhohk hk

    Bocdck{ f `ouxolxk ~opo ~pfyop q{k# km q{oduq{kp hfu hfdu uduxkmou dlkpedodu U k U# o

    ifpomkhdho ukp o mkumo# I= I " , Efmf o ifpo kcxpdeo uf`pk {mo eopbo q

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    hoho ~fp I =q K ukb{k-uk q{k K= K " k# ~fpxolxf# =" ,

    O~cdeolhf ou xpoluifpmoku hk Bocdck{# kq{oku *?,?$# f`xkmfu

    Lf uduxkmo dlkpedoc U o kq{of hk flho *5,?8$ ukp kuepdxo efmf

    O kq{of hk flho lf molxkyk o ifpmo q{olhf xpoluifpmoho hk {m uduxkmo

    dlkpedoc ~opo f{xpf, Duuf udbldideo q{k f kckxpfmoblkxdumf lf kux uoxduiowklhf f

    ^pdle~df ho Pkcoxdydhohk hk Bocdck{,

    O ufc{f hk Cfpklxw ~opo f lfyf ~pf ckmo ukmkcjolxk q{kco km~pkboho lf

    kz~kpdmklxf hk Mdejkcufl - Mfpckt# q{oc ukgo# u{~fp q{k fu efm~pdmklxfu q{k

    kuxdykpkm lo hdpkf hf mfydmklxf km pkcof of xkp - pk~pkuklxohf ~kcf uduxkmo

    dlkpedoc U - hkykm ukp eflxpohfu ~fp {m ioxfp ?y 0 &e0 , Hkuxo ykw# ~fpm# o

    ufc{f odlho dlu{idedklxk k Cfpklxw ifd f`pdbohf o ~fux{cop {m iklmklf lfyf# o

    hdcoxof - f{ hdcof - hf xkm~f,

    Lo hdcoxof hf xkm~f fu dluxp{mklxfu hk mkhdho hk xkm~f pkbduxpopdom#

    q{olhf km mfydmklxf km pkcof of xkp# dlxkpyocfu hk xkm~f modfpku ~fp {m ioxfp

    ?y0 & e0 hf q{k fu dlxkpyocfu hk xkm~f mkhdhfu ~kcfu pkcbdfu km pk~f{uf km

    pkcof of xkp, Ouudm#

    k o kq{of hk flho xkm u{o ifpmo fpdbdloc pkuxo{poho lf uduxkmo U, Hdwkmfu q{k

    o kq{of efyopdolxk uf` f eflg{lxf hk xpoluifpmoku {uohou,

    ^kco mkumo ~feo *~pdmkdpfu olfu hf ue{cf ZZ$ Jklpd ^fdleop ~kpek`k{ q{k

    ou h{ou jd~xkuku hk Cfpklxw# ho eflxpof hf efm~pdmklxf k ho hdcoxof hf

    xkm~f# mfhdideoyom hk mfhf efluduxklxk ou xpoluifpmoku hk Bocdck{

    *kq{oku ?,?$ k eflu~dpoyom ~opo dm~khdp q{k q{ocq{kp mfydmklxf km pkcofof xkp ifuuk f`ukpyohf, ^fdleop f`ukpyf{ q{k "{mo eflu~dpof efm~ckxo # ~fp

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  • 8/4/2019 15-relatividade-restrita-usp

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    ud u# {mo ckd ho lox{pkwo" k ~pf~u q{k o dm~fuud`dcdhohk hk hkxkexop mfydmklxf

    o`ufc{xf km pkcof of xkp ifuuk xfploho {mo lfyo ckd ho lox{pkwo, Ykphohkdpf

    kuecopkedmklxf uf`pk f udbldideohf iudef hkuuo lfyo ckd ho lox{pkwo ydpdo o~klou

    km ?4>;# efm o ~{`cdeof hk {m opxdbf dlxdx{cohf "W{p Kckaxpfhtlomda `krkbxkp

    Ap~kp" *Uf`pk o Kckxpfhdlmdeo hk Efp~fu km Mfydmklxf$ lfuOllockl hkp jtuda

    ?2# :4? *?4>;$# ~fp ~opxk hk {m gfykm iudef k kzomdlohfp hf kuepdxpdf U{f hk~oxklxku km @kplo# Oc`kpx Kdluxkdl,

    8,? ^FUX[COHFU HO PKCOXDYDHOHK HK KDLUXKDL

    O xklxoxdyo hk kuxklhkp o yduf-hk-m{lhf ~p~pdo ho mkeldeo hk Lkrxfl of

    kckxpfmoblkxdumf hk Mozrkcc ckyf{ o updou hdide{chohku q{k u ~{hkpom ukp

    eflxfplohou efm jd~xkuku op`dxppdou eo~owku hk hkuidb{pop xolxf o mkeldeo

    q{olxf f kckxpfmoblkxdumf,

    Uo`do-uk q{k o mkeldeo hk Lkrxfl hoyo eflxo hk xfhfu fu iklmklfu q{k

    klyfcydom `odzou ykcfedhohku mou q{k joydo ~pf`ckmou km hkuepkykp f ldef

    iklmklf hk ocxo ykcfedhohk efljkedhf# o ~pf~obof ho c{w, ^fp f{xpf cohf# f

    kckxpfmoblkxdumf hk Mozrkcc hkuepkydo fu iklmklfu ~xdefu efm ~kpikdf, ^fp q{k

    lf molxkp f kckxpfmoblkxdumf dlocxkpohf k mfhdideop f q{k ifuuk lkekuupdf lo

    mkeldeo ~opo q{k kuxo ifuuk efm~oxykc efm ou ~pkyduku hf kckxpfmoblkxdumf6Ifd kzoxomklxk duuf q{k Kdluxkdl ~pf~u km ?4>;# of om~cdop f podf hk of hf

    ^pdle~df ho Pkcoxdydhohk k kckbkp {mo hou modu dm~pkuudflolxku eflukq{ledou hf

    kckxpfmoblkxdumf efmf `ouku hk {mo lfyo efm~pkkluf ho lox{pkwo kz~pkuuo km

    hfdu ~fux{cohfu# f ^PDLE^DF HO PKCOXDYDHOHK k o CKD HK ^PF^OBOF HO

    C[W,

    Kdu f ^PDLE^DF HO PKCOXDYDHOHK hk Kdluxkdl7

    [mo eflukqledo dmkhdoxo hf ^pdle~df ho Pkcoxdydhohk hk

    Kdluxkdl o o`fcdf hf xkp efmf uduxkmo dlkpedoc ~pdydckbdohf, Ukm

    xkp f{xpf ~o~kc o e{m~pdp# o lff hk xkp oeo`f{ ~fp hkuiowkp-uk,

    F ukb{lhf ~ouuf hk Kdluxkdl ifd kckyop {m ioxf

    kz~kpdmklxocmklxk ykpdideohf eflhdf hk ~fux{cohf udef ho xkfpdo7

    ?0

    XFHFU FU UDUXKMOU DLKPEDODU UF K_[DYOCKLXKU ^OPO OIFPM[COF HK XFHOU OU CKDU HO LOX[PKWO,

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    F ukb{lhf ~fux{cohf oidpmo# km ~opxde{cop# q{k o

    hku~kdxf hf q{f p~dhf lfu o~pfzdmkmfu f{ oiouxkmfuhk {m udloc c{mdlfuf kuxk ukm~pk xkp o mkumo

    ykcfedhohk e km pkcof o lu, Kdluxkdl ~kpek`k{ q{k kuxo

    eflukqledo kckmklxop ho CKD HK ^PF^OBOF HO

    C[W kzdbk q{k lfuuou lfku hk Ku~of k Xkm~f ukgom

    ukpdomklxk pkyduxou,

    8,0 UDM[CXOLKDHOHK

    Hkykmfu ckyop km eflxo q{k xfhfu fu g{wfu lfu q{odu f xkm~f xkljo ocb{m

    ~o~kc uf# ukm~pk# g{wfu hk kyklxfu udm{cxlkfu, _{olhf hdbf# ~fp kzkm~cf# q{k

    "f xpkm ejkbo oq{d u ukxk jfpou" q{kpf hdwkp ocbf efmf "o uf`pk~fudf hf

    ~flxkdpf ~kq{klf hf mk{ pkcbdf uf`pk f ocbopdumf ukxk k o ejkboho hf xpkm uf

    kyklxfu udm{cxlkfu",

    F ~opbpoif oedmo {m kzekpxf hf opxdbf hk ?4>; hk Oc`kpx Kdluxkdl ~{`cdeohf

    lfu Ollockl hkp ^jtuda k dc{uxpo o dm~fpxledo ho lff hk udm{cxolkdhohk hk

    kyklxfu lo hkuepdf q{k iowkmfu ho lox{pkwo,

    [mo `fo ifpmo hk hkidldp# km xkpmfu f~kpoedflodu# o fefppledo udm{cxlko hk

    hfdu kyklxfu hdwkp q{k fu kyklxfu ^k _# q{k fefppkm lfu ~flxfu ^ k _ hk {m

    uduxkmo dlkpedoc U ukpf udm{cxlkfu km U uk k ufmklxk uk c{w kmdxdho q{olhf ho

    fefppledo hfu hfdu kyklxfu ejkbop udm{cxolkomklxk of ~flxf mhdf M hf

    ukbmklxf ^_ km U, Lf j ~pf`ckmo km uo`kp uk hfdu kyklxfu q{k oeflxkekm lf

    mkumf ~flxf uf udm{cxlkfu f{ lf, O hkidldf o~pkuklxoho ~kpmdxk kuxklhkp olff hk udm{cxolkdhohk ~opo kyklxfu q{k oeflxkekm oiouxohfu {m hf f{xpf,

    U{~fljo q{k hfdu kyklxfu ^k _# q{k oeflxkekm lfu ~flxfu ^ k _ hf uduxkmo

    dlkpedoc U# ukgom udm{cxlkfu, ^fp uk{ x{plf# U {m

    uduxkmo dlkpedoc q{k uk mfyk lo hdpkf ^_ efm

    ykcfedhohk y k lkck ^ k _ uf fu ~flxfu km q{k fu

    kyklxfu ^k _fefppkm# klq{olxf M f ~flxf mhdf hf

    ukbmklxf ^_, O udx{of# xoc efmf yduxo hk U# mfuxpoho lo Idb, 91 o ~opxk *o$ ho idb{po pkxpoxo o

    ?5

    O C[W ^PF^OBO-UK# LF YE[F# HK MFHF PKXDCLKF K EFM O MKUMO YKCFEDHOHK EKM XFHFU FU XKM^FU# KM XFHOU OU HDPKKU K KM XFHFU FU UDUXKMOU DLKPEDODU#O HKU^KDXF HF KUXOHF HK MFYDMKLXF HO IFLXK HK C[W,

    O

    O

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    udx{of lf dluxolxk km q{k f kyklxf ^ fefppk{ klq{olxf o ~opxk *`$ {m pkxpoxf hf

    q{k oeflxkedo q{olhf o c{w ydlho hf ~flxf ^ ejkbf{ of ~flxf mhdf M hf ukbmklxf ^_,

    [mo ykw q{k fu kyklxfu ^k _uf udm{cxlkfu km U o c{w q{k ykm hfu ~flxfu

    ^ k _ ejkbop udm{cxolkomklxk km M, Efmf o c{w ckyo {m ekpxf xkm~f klxpk u{o

    kmduuf k u{o ejkboho of ~flxf M# fu hfdu ~flxfu mhdfu M k M

    lf modu efdledhdpf q{olhf o c{w ejkbop o M, Fu hfdu udlodu

    c{mdlfufu# ydlhfu hk ^ k hk _# lf ~fhkm uk kleflxpop xolxf km

    M q{olxf km M k ~fpxolxf eflec{mfu q{k o udm{cxolkdhohk hk

    kyklxfu km U lf ckyo# lkekuuopdomklxk# udm{cxolkdhohk hk

    kyklxfu km U,O lff hk Xkm~f O`ufc{xf dlefm~oxykc efm xoc eflec{uf k ho

    ykm o lkekuudhohk hk pkyduf hk lfuuou eflek~ku hk Ku~of k Xkm~f,

    8,5 EFMF EFLUXP[DP [M UDUXKMO HK PKIKPLEDO

    ukm~pk ~fuuykc kuepkykp ou ckdu ho lox{pkwo ukm iowkp mklf o q{ocq{kp

    uduxkmo hk pkikpledo, Ouudm# I =mo lf xpow q{ocq{kp dlhdeof hf uduxkmo hk

    pkikpledo km q{k mkhdmfu o ifpo# o mouuo f{ o oekckpof, Xfhoydo#

    dm~fpxolxk ~fhkp o~cdeop {mo ckd ho lox{pkwo o ocb{mo udx{of ku~keideo k# lkuuk

    eouf# o efluxp{f hk {m uduxkmo hk pkikpledo yocdfuo, O pkcoxdydhohk hk Kdluxkdl

    kludlo o ukp `ouxolxk e{dhohfuf lkuuk ~pfekuuf,

    [mo hou ifpmou hk efluxp{dp {m uduxkmo hk pkikpledo pk{ldp {m bp{~f hk

    ~kuufou# fu f`ukpyohfpku# q{k kuxkgom km pk~f{uf klxpk ud, Eoho {mo hkuuou

    ~kuufou pku~fluykc ~fp pkbduxpop ou effphklohou# ku~oedodu k xkm~fpodu

    *ku~ofxkm~fpodu# ~fdu ykpkmfu q{k ku~of k xkm~f kuxf `km modu {ldhfu obfpo

    hf q{k kuxoyom lo pkcoxdydhohk hk Bocdck{$# hk q{ocq{kp kyklxf q{k oeflxko km

    u{o ydwdljolo, ^opo xoc# ~pkeduf q{k eoho {m hfu f`ukpyohfpku uod`o u{o

    ~fudf km pkcof o {mo fpdbkm op`dxpopdomklxk kuefcjdho k xkljo {m pkcbdf q{k

    kuxkgo udlepfldwohf efm fu pkcbdfu hk uk{u efckbou,

    F ~pdmkdpf ~ouuf kuefcjkp o fpdbkm F hf uduxkmo, Km ukb{dho# kuefcjkm-uk xpuhdpkku m{x{omklxk fpxfbflodu ~opo pk~pkuklxop fu kdzfu eopxkudolfu Fz# Ft k

    Fw, Efm duuf# eoho f`ukpyohfp eo~ow hk hkxkpmdlop fu yocfpku hfu lb{cfu ~fcop

    k owdm{xoc q{k eopoexkpdwom cdljo q{k f cdbo o fpdbkm, ^opo hkxkpmdlop u{o

    hduxledo fpdbkm eoho f`ukpyohfp hkyk klydop {m ~{cuf hk c{w km hdpkf o {m

    ku~kcjf lo fpdbkm k mkhdp f dlxkpyocf hk xkm~f x lkekuupdf ~opo q{k o c{w

    pkxfplk, Efmf - kuuo o Ckd hk ^pf~obof ho C{w - o c{w ukm~pk ~pf~oboho efm

    ykcfedhohk e *lf ye{f$ o hduxledo hk eoho f`ukpyohfp fpdbkm ukp xe & 0 , Duuf u{idedklxk ~opo q{k eoho f`ukpyohfp uod`o f yocfp hk u{ou effphklohou z# t k w,

    ?8

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    Obfpo# ~pkeduf udlepfldwop fu pkcbdfu hk xfhfu fu f`ukpyohfpku hk {m mkumf

    uduxkmo hk pkikpledo, [mo ifpmo hk iow-cf efm`dlop q{k lf dluxolxk hk xkm~f

    x = ># mopeohf lf pkcbdf hf f`ukpyohfp q{k kuxdykp lo fpdbkm# kuxk klydop {m

    ~{cuf kuipdef hk c{w - `ouxo oeklhkp {mo cm~oho - q{k uk ~pf~obop k ukp

    hkxkexohf ~fp xfhfu fu f`ukpyohfpku hf uduxkmo hk pkikpledo, ^opo q{k kuxk ~{cuf

    ejkb{k o {m f`ukpyohfpO udx{ohf o {mo hduxoledo H ho fpdbkm ukp lkekuupdfku~kpop {m dlxkpyocf hk xkm~f H & e, Ouudm# lf mfmklxf km q{k f f`ukpyohfpO

    pkek`kp f ~{cuf hk c{w f pkcbdf hf f`ukpyohfp lo fpdbkm kuxop mopeolhf H & e,

    ^opo q{k fu pkcbdfu ukgom udlepfldwohfu f f`ukpyohfp O hkyk# of pkek`kp f ~{cuf

    hk c{w# og{uxop uk{ pkcbdf ~opo f dluxolxk hk xkm~f H & e, Uk xfhfu ukb{dpkm kuuk

    ~pfekhdmklxf uk{u pkcbdfu kuxopf udlepfldwohfu,

    Hkyk-uk lfxop q{k f mxfhf hkuepdxf ~fhk ukp {uohf xolxf km uduxkmou

    dlkpedodu q{olxf km uduxkmou lf-dlkpedodu mou q{k joykp ~pf`ckmou eouf f{xpf

    bp{~f hk f`ukpyohfpku# km mfydmklxf km pkcof of bp{~f fpdbdloc# xklxk {uop fu

    udlodu hk c{w hf bp{~f fpdbdloc ukm oxklxop ~opo f mfydmklxf pkcoxdyf klxpk fu hfdu

    bp{~fu,

    ^fhk ukp xdc eoce{cop o iocxo hk udlepfldo q{k fu f`ukpyohfpku hk {m uduxkmo

    dlkpedoc oxpd`{dpf ofu pkcbdfu hfu f`ukpyohfpku hk f{xpf uduxkmo dlkpedoc, U{~fljo

    q{k o hduxledo klxpk fu ~flxfu ^ k _ ho Idb, 9 ukgo k q{k lo udx{of ho Idb, 9o

    {m ~{cuf hk c{w ukgo kmdxdhf hf ~flxf M lf dluxolxk x = >, Lf j h{ydho q{olxf

    hduxledo q{k uk~opo f ~flxf M hfu ~flxfu ^ k _ ukb{lhf fu f`ukpyohfpku hk U#

    & 0 *lfxk q{k lo udx{of ho Idb, 9o fu ~flxfu ^# ^ k _# _ uf efdledhklxku$, _{olhf

    o c{w ejkbop of ~flxf I lf dluxolxk x^" , kuxk kuxop {m ~f{ef hdpkdxo hf ~flxf ^ k o

    c{w ~pkeduop ~kpefppkp o~klou ex^"=&0yx~" , Of ejkbop of ~flxf _ lf dluxolxk x_"

    o c{w xkp ~kpefppdhf ex_"=&0!yx_"#

    Ouudm#

    K fu pkcbdfu hfu f`ukpyohfpku ^ k _ kuxopf ifpo hk ~ouuf# ukb{lhf fu

    f`ukpyohfpku hf uduxkmo U# ~fp {mo q{olxdhohk hoho ~fp

    ?;

    x_"= &0ey

    x_"x^"=y &e0

    ?y0 &e0

    x^"= &0e!y k

    O

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    8,8 XPOLUIFPMOKU HK CFPKLXW

    O eo~oedhohk hk efm{ldeop k efm~opop fu pku{cxohfu hfu modu hdykpufu

    kz~kpdmklxfu {m hfu ~dcopku xolxf hf mxfhf edklxidef hk dlykuxdbop o lox{pkwo

    q{olxf hf hkuklyfcydmklxf xkelfcbdef, hk ydxoc dm~fpxledo uo`kp efmf o

    hkuepdf hk {mo ukqledo hk kyklxfu ikdxo ~kcfu f`ukpyohfpku hk {m uduxkmo

    dlkpedoc hdikpk ho hkuepdf ho mkumo ukqledo hk kyklxfu ikdxo ~kcfu f`ukpyohfpku

    hk f{xpf uduxkmo dlkpedoc, Modu ohdolxk *ukf 8,?0$ ykpkmfu q{k fu f`ukpyohfpku

    hk hfdu uduxkmou dlkpedodu hduxdlxfu lf ~pkeduom eflefphop lkm mkumf efm o

    fphkm xkm~fpoc hk {mo ukqledo hk kyklxfu# hkuhk q{k xodu kyklxfu oeflxkom

    km ~flxfu u{idedklxkmklxk hduxolxku,

    Efmf ou effphklohou oxpd`{hou o {m kyklxf ^~kcfu f`ukpyohfpku hf uduxkmo

    dlkpedoc U uf xpoluifpmohou ~opo ou effphklohou oxpd {hou of mkumf kyklxf ^

    ~kcfu f`ukpyohfpku hf uduxkmo dlkpedoc U6 O mkcjfp ifpmo hk pku~flhkp o kuuo

    q{kuxf efludhkpop f efm~fpxomklxf ho c{w# yduxf q{k u{o ~pf~obof ouu{lxf

    hk {m hfu ~fux{cohfu ho pkcoxdydhohk hk Kdluxkdl, ^fp klq{olxf# loho uo`kmfu

    uf`pk f efm~fpxomklxf hk kcxpflu# o{xfmykdu f{ pb{ou mou uo`kmfu q{k km

    xfhfu fu uduxkmou dlkpedodu o c{w uk ~pf~obo efm o mkumo ykcfedhohk e# o hku~kdxf

    hf kuxohf hk mfydmklxf ho iflxk hk c{w,

    Lf dluxolxk hk xkm~f x = > {m ~{cuf hk c{w kmdxdhf ho fpdbkm F hf uduxkmo

    dlkpedoc U, ^opo udm~cdideop o olcduk ohmdxo q{k lkuuk kzoxf dluxolxk o fpdbkm F hfuduxkmo dlkpedoc U efdledho efm o fpdbkm F

    hk U k q{k fu pkcbdfu {uohfu ~opo mkhdp f

    xkm~f km U k oq{kcku {uohfu km U ukgom

    xfhfu oekpxohfu hk mfhf o dlhdeop x => = x"

    q{olhf ou fpdbklu F k F kuxdykpkm

    uf`pk~fuxou, Ocm hduuf# fu kdzfu Fz k

    Fz#Ft k Ft# Fw k Fw uf ~opockcfuhfdu o hfdu, ^fp idm# f uduxkmo U mfyk-uk efm ykcfedhohk efluxolxk y =y d km

    pkcof o U, O kuuo eflidb{pof# mfuxpoho lo Idb, 2# ejomomfu eflidb{pof

    ~ohpf,

    F ~{cuf hk c{w kmdxdhf lou effphklohou ku~ofxkm~fpodu *z = ># t = ># w = ># x =

    >$ km U k *z = ># t = ># w = ># x = >$ km U oxdlbdp f ~flxf ^ hk effphklohou *z# t#

    w$ lf xkm~f x# ukb{lhf fu f`ukpyohfpku hk U# eopoexkpdwolhf f kyklxf ^, Ukb{lhf

    fu f`ukpyohfpku hk U# f mkumf kyklxf xkm effphklohou *z# t# w# x$, _{oc o pkcof

    klxpk ou effphklohou *z# t# w# x$ k ou effphklohou *z#t#w#x$6

    O Ckd hk ~pf~obof ho C{w ~kpmdxk kuepkykp {mo kq{of ~opo cfeocdwop

    ?9

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    fu ~flxfu ~kpxkleklxku o ipklxk hk flho kuipdeo hf ~{cuf hk c{w# xolxf lf uduxkmo

    U#

    q{olxf lf uduxkmo U#

    F udbldideohf hk eoho kq{of udm~cku7 lf uduxkmo U*U$ o c{w kz~olhk-uk

    kuikpdeomklxk efm ykcfedhohk e k bouxo {m xkm~f x *x$ ~opo oxdlbdp f ~flxf ^ udx{ohf o

    {mo hduxledo z0 !t0 !w0 z"0 !t"0 !w"0 ho fpdbkm F *F$ lo q{oc kuxoyo o iflxk hk

    c{w,

    Efmf ou ckdu ho lox{pkwo uf ou mkumou km q{ocq{kp uduxkmo dlkpedoc k efmf o

    Ckd hk ^pf~obof ho C{w {mo ckd ho lox{pkwo ~pkeduf q{k

    uklhf o {mo efluxolxk dlhk~klhklxk ho ykcfedhohk y klxpk fu uduxkmou dlkpedodu,

    Lf eouf xpdydoc km q{k y=> ou effphklohou hfu ~flxfu ho ipklxk hk flho hf ~{cuf

    hk c{w uf ou mkumou xolxf km U q{olxf km U *lo ykphohk# U dhlxdef o U$ k o

    kq{of *8,5$ hkyk ukp {mo dhklxdhohk xpdydoc#

    Efmf o dlhk~klhklxk ho ykcfedhohk uk{ yocfp ukp ukm~pk ? k o kq{of *8,5$ xfplo-

    uk

    F ^pdle~df ho Pkcoxdydhohk kzdbk q{k {mo ~opxe{co km mfydmklxf pkxdclkf

    {ldifpmk km pkcof o U kuxkgo xom`m km mfydmklxf pkxdclkf {ldifpmk km

    pkcof o U, ^opo xoc# ~pkeduf q{k o xpoluifpmof hk effphklohou ukgo cdlkop',Ou xpoluifpmoku klxpk ou effphklohou ku~oedodu ~kp~klhde{copku hdpkf hk

    mfydmklxf pkcoxdyf klxpk fu uduxkmou U k U uf udm~ckumklxk

    ^opo eflyklekp-uk hduuf# u{~fljo q{k h{ou pb{ou P k P dhlxdeou# {mo uf`pk f

    kdzf Ft k f{xpo uf`pk f kdzf Ft# kuxkgom om`ou efm u{o kzxpkmdhohk dlikpdfp uf`pk o

    fpdbkm hf uduxkmo dlkpedoc lf q{oc o pku~kexdyo pb{o kux km pk~f{uf# efmf mfuxpo o' Eflyklo-uk hduuf efm {mo xpoluifpmof lf-cdlkop ho ifpmo z = z - yx ! x0, Uk km U f mfydmklxf pkxdclkf {ldifpmkhk {mo ~opxe{co hkuepdxf ~fp z = yx# km U f mfydmklxf ho ~opxe{co ukp hkuepdxf ~fp z = x0# q{k lf eopoexkpuxdefhk {m mfydmklxf pkxdclkf {ldifpmk, Lkuuk eouf# U lf {m uduxkmo dlkpedoc,

    ?2

    z0 !t0 !w0 =e0 x0

    z"0

    !t"0

    !w"0

    =e0

    x"0

    *8,?$

    *8,0$

    #

    ,

    z0 !t0 !w0e0 x0 =o z"0 !t"0 !w"0e0 x"0 *8,5$#

    z0 !t0 !w0e0 x0 z"0 !t"0 !w"0e0 x"0 o=?

    #

    ,

    *8,8$

    z0 !t0 !w0e0 x0 =z"0 !t"0 !w"0e0 x"0,*8,;$

    t"=t

    w"=w*8,9$

    ,

    O

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    Idb, :o,

    Uk f mfydmklxf eo{uop# ~fp kzkm~cf# o

    hdmdl{df hf efm~pdmklxf ho pb{o fu

    f`ukpyohfpku hk U hdpf q{k o pb{o P mklfp

    hf q{k o pb{o kuxoedflpdo P *Idb, :`$, Uk ou

    kzxpkmdhohku hou pb{ou ~fuu{pkm ~kq{kloucmdlou {mo mopeo dlhkcykc ukp hkdzoho ~kco

    pb{o P uf`pk f efp~f ho pb{o P,

    F ^pdle~df ho Pkcoxdydhohk bopolxk q{k fu

    f`ukpyohfpku hk U hdpf q{k o pb{o mykc P

    modu e{pxo hf q{k o pb{o kuxoedflpdo P *Idb, :e$,

    [mo mopeo dlhkcykc ukp hkdzoho ~fp P uf`pk f

    efp~f hk P,J {mo ldeo ifpmo hk kz~cdeop efmf P ~fhk

    mopeop P *ukb{lhf fu f`ukpyohfpku hk U$ of

    mkumf xkm~f km q{k P mopeo P *ukb{lhf fu

    f`ukpyohfpku hk U$, ~pkeduf q{k ou h{ou pb{ou#

    {mo mykc k f{xpo kuxoedflpdo ukb{lhf fu hfdu eflg{lxfu hk f ukpyohfpku#

    xkljom f mkumf efm~pdmklxf, Ouudm# ou effphklohou ku~oedodu ~kp~klhde{copku

    hdpkf hf mfydmklxf pkcoxdyf lf uf ocxkpohou,

    ^opo ou effphklohou z k x xkmfu

    Uk y = > hkykmfu kleflxpop

    k ~fpxolxf ou i{lku *y$# *y$# *y$ k *y$ yockm# ~opo y = >#

    Ou xpoluifpmoku dlykpuou hou kq{oku *8,2$ uf

    ?:

    ex"=z!ex

    z"=z!ex *8,2$

    > => = >

    > =?= >

    ,

    z"=z

    ex"=ex *8,:$

    *8,4$,

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    k hkykmfu kzdbdp q{k - > ,

    O fpdbkm F hk U *efm ykcfedhohk hz&hx = > km U$ xkm ykcfedhohk hz & hx = y

    km pkcof o U k ~fpxolxf

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  • 8/4/2019 15-relatividade-restrita-usp

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    Ou xpoluifpmoku kleflxpohou uf ejomohou XPOLUIFPMOKU HK

    CFPKLXW k uf eflukqledo dmkhdoxo hfu hfdu ~fux{cohfu hk Kdluxkdl, Ou

    xpoluifpmoku hk Cfpklxw uf o ufc{f modu udm~cku *efm kzekf ho ufc{f

    xpdydoc y = >$ hf ~pf`ckmo hk pkcoedflop ou effphklohou hk hfdu uduxkmou dlkpedodu hk

    molkdpo xoc q{k {m ~{cuf kuipdef hk c{w efm ykcfedhohk e lf f{xpf uduxkmo,

    {mo xopkio udm~cku dlykpxkp ou xpoluifpmoku hk Cfpklxw, Kuq{ko ou

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    pkcof o U, Ouudm

    `ouxolhf xpfeop fu ~o~du hou effphklohou hk U k hk U k dlykpxkp f uklxdhf *k f

    udloc$ ho ykcfedhohk lou xpoluifpmoku hk Cfpklxw,

    _{olhf o ykcfedhohk pkcoxdyo y ~kq{klo km efm~opof ykcfedhohk ho c{w e

    *y&e 33 ?$ f ioxfp hk Cfpklxw *y$ xklhk o {ldhohk k u xpoluifpmoku hk Cfpklxw

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    q{k uf m{dxf ~opkedhou efm ou xpoluifpmoku hk Bocdck{ ho iudeo hk Lkrxfl

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    z # ukpdo pku~fluykc ~kco iocxo hk

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  • 8/4/2019 15-relatividade-restrita-usp

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    udlepfldo klxpk pkcbdfu km mfydmklxf# mou# lfu kz~kpdmklxfu ~fuuykdu ox o

    mkxohk hf ue{cf ZDZ o q{olxdhohk ex bkpocmklxk m{dxf modfp hf q{ky

    ez ,

    Lkuuou eflhdku dm~fuuykc hkxkexop ocb{m hkuydf o~pkedykc ho lff hk

    Xkm~f O`ufc{xf k# lo ~pxdeo# x x, Duuf kz~cdeo f klfpmk u{ekuuf ho iudeo hk

    Lkrxfl# q{k ~fp hfdu ue{cfu cdhf{ efm iklmklfu km `odzou ykcfedhohku k km

    udx{oku lou q{odu x x,

    8,; EFLXPOF HK EFM^PDMKLXF HK CFPKLXW-IDXWBKPOCH

    Lf uduxkmo dlkpedoc U j {mo `oppo km pk~f{uf of cflbf hf kdzf Fz, Efmf o

    `oppo kux km pk~f{uf lf ~pkeduf mkhdp ou effphklohou hk ~fudf hk uk{u

    kzxpkmfu# z? k z0# hk mfhf udm{cxlkf km U, F efm~pdmklxf ho `oppo# ukb{lhf fu

    f`ukpyohfpku hk U#

    k ejomohf f EFM^PDMKLXF ^P^PDF# F[ HK PK^F[UF# HO @OPPO,

    ^fp f{xpf cohf# f uduxkmo U *k efm kck# o `oppo$ mfyk-uk efm ykcfedhohk y =y d

    km pkcof of uduxkmo dlkpedoc U, Lkuuk uduxkmo modu efm~cdeohf mkhdp f

    efm~pdmklxf ho `oppo mykc, Obfpo# ~pkeduf e{dhop ~opo q{k ou mkhdhou hou

    effphklohou hfu kzxpkmfu ho `oppo ukgom ikdxou udm{cxolkomklxk

    *udm{cxolkomklxk km U7 g ydmfu q{k lo pkcoxdydhohk hk Kdluxkdl o udm{cxolkdhohkhk kyklxfu hk~klhk hf uduxkmo dlkpedoc km q{k ou mkhdhou uf ikdxou$, O hkidldf

    hf efm~pdmklxf C ho `oppo km U '

    ^opo pkcoedflop fu efm~pdmklxfu C> k C `ouxo o~cdeop ou xpoluifpmoku hk

    Cfpklxw *8,?9$#

    k eoce{cop

    ' Efmf fu pkcbdfu hfu f`ukpyohfpku uk U kuxf udlepfldwohfu# `ouxo q{k efm`dlkm q{k fu f`ukpyohfpku q{k kuxdykpkmmodu ~pzdmfu hou kzxpkmdhohku ho `oppo km {m hohf jfppdf ~pkydomklxk kuxo`kckedhf pkbduxpkm o ~fudf hk eohokzxpkmdhohk, Kuuk f mfhf modu udm~cku hk iowkp f`ukpyoku udm{cxlkou,

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  • 8/4/2019 15-relatividade-restrita-usp

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    Ouudm# fu f`ukpyohfpku hk U hdpf q{k o `oppo km mfydmklxf ~fuu{d

    efm~pdmklxf

    mklfp hf q{k f efm~pdmklxf ~p~pdf C> oxpd`{hf `oppo ~kcfu f`ukpyohfpku hk U#

    q{k kuxf km pk~f{uf km pkcof `oppo *ykp Idb, 4$,

    [m iklmklf ~opkedhf efm kuuk ifd oyklxohf efmf ~fuuykc kz~cdeof hf

    pku{cxohf lkboxdyf hf kz~kpdmklxf hk Mdejkcufl - Mfpckt ~fp Cfpklxw k IdxwBkpoch

    {mo heoho olxku ho pkcoxdydhohk hk Kdluxkdl *y, ukf 5,5$ efmf xklxoxdyo hk uocyop

    o lff hk xkp, C# C> kpo f efm~pdmklxf q{k o `oppo xkpdo uk kuxdykuuk km pk~f{uf

    km pkcof of xkp, Oq{d# f iklmklf udmxpdef7 uk fu f`ukpyohfpku hk U mkhdpkm

    f efm~pdmklxf C hk {mo `oppo hk efm~pdmklxf ~p~pdf C> q{k kuxkgo km pk~f{uf km

    pkcof o U hkuef`pdpf q{k C = C> & *y$, O `oppo km mfydmklxf ukm~pk mklfp hf

    q{k o mkumo `oppo km pk~f{uf mou lf j eflxpohdf ocb{mo7 o udm{cxolkdhohk

    lf uduxkmo U hdikpk ho udm{cxolkdhohk lf uduxkmo U,

    ^opo o~pkedop f ~o~kc ho udm{cxolkdhohk hou mkhdhou hfu kzxpkmfu Z0*x$ k Z?*x$

    efludhkpk f ukb{dlxk kz~kpdmklxf ikdxf ~opo xklxop mkhdp f efm~pdmklxf ho `oppo kmmfydmklxf, Hfdu pkcbdfu uf efcfeohfu eoho q{oc km {mo hou kzxpkmdhohku ho

    `oppo k udlepfldwohfu km U# uduxkmo lf q{oc o `oppo kux km pk~f{uf, Lf dluxolxk

    hk xkm~f x = > eoho {m hkcku kmdxk {m ioejf hk c{w lo hdpkf Ft, Fu ioejfu hk

    c{w uf eo~xohfu ~fp hfdu hkxkexfpku hk {mo updk hk hkxkexfpku ku~ocjohfu uf`pk

    f kdzf Fz hf uduxkmo U, O hduxledo klxpk kuuku hfdu hkxkexfpku ukp o hdikpklo

    klxpk ou ~fudku

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    hfu hkxkexfpku k ukp

    O hdikpklo klxpk kuuk pku{cxohf k f pku{cxohf efppkxf *kq, 8,05$ kux lf ioxf hk

    q{k obfpo xklxomfu mkhdp f efm~pdmklxf ho `oppo mykc# ~opo f`ukpyohfpku hk U#{uolhf o udm{cxolkdhohk km U ho kmduuf hk c{w lfu kzxpkmfu ho `oppo klq{olxf

    olxkpdfpmklxk o mkhdho ifd ikdxo ckyolhf km eflxo o udm{cxolkdhohk xoc efmf

    hkidldho km U, Fu f`ukpyohfpku hk U hdpf q{k f ioejf hk c{w ho kzxpkmdhohk ho

    ipklxk ho `oppo ifd hdu~opohf *y$ yC> & e0 hk~fdu hf hdu~opf hf ~pdmkdpf ioejf,

    ecopf# klxf# q{k o kzxpkmdhohk ho ipklxk kuxop modu ipklxk hf q{k hkykpdo k q{k

    o mkhdho lf xkp udhf ikdxo efppkxomklxk# ~fdu o `oppo kux km mfydmklxf,

    _{olhf mkhdmfu f efm~pdmklxf hk {mo `oppo q{k kuxkgo hdu~fuxo~kp~klhde{copmklxk km pkcof o hdpkf hk uk{ mfydmklxf loho oeflxkek# ~fdu

    t = t k w = w, Km ~opxde{cop# duuf udbldideo q{k kuuou mkhdhou lf ~pkeduom ukp

    ikdxou hk mfhf udm{cxlkf km q{ocq{kp uduxkmo dlkpedoc,

    8,9 HDCOXOF HF XKM^F

    Hfdu kyklxfu# ? k 0# oeflxkekm lo mkumo ~fudf ku~oedoc z mou lfu

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    uduxkmo U?, Of dlxkpyocf hk xkm~f x> =x"0x"? ejomopkmfu f DLXKPYOCF HK

    XKM^F ^P^PDF x>, Fu mkumfu kyklxfu oeflxkekpf# ukb{lhf fu

    f`ukpyohfpku hk U# lfu dluxolxku hk xkm~f

    k ~fpxolxf f dlxkpyocf hk xkm~f# km U# klxpk fu kyklxfu ? k 0 ukp

    Dlxkpyocfu hk xkm~f klxpk kyklxfu q{k oeflxkekm lf mkumf c{bop lf uduxkmodlkpedoc U uf modfpku q{olhf mkhdhfu lf uduxkmo dlkpedoc U# km mfydmklxf km

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    pkcof o U# hf q{k q{olhf mkhdhfu km U#

    ^opo klxklhkp mkcjfp kuuk pku{cxohf k pkuuocxop f ~o~kc

    ep{edoc ho Efluxledo ho ykcfedhohk ho c{w efluxp{omfu {m

    pkcbdf hk c{w km U? efluxdx{hf ~fp {mo iflxk hk c{w lo fpdbkm

    F k {m ku~kcjf o {mo hduxoledo C ho fpdbkm k ~kp~klhde{cop of

    kdzf Ft *ykp Idb, ?>$,F dlxkpyocf hk xkm~f lkekuupdf ~opo q{k o c{w y of

    ku~kcjf k yfcxk pkickxdho o fpdbkm F db{oc o

    F pkcbdf ~fhk kzd`dp km {m mfuxpohfp f yocfp hf dlxkpyocf hk xkm~f q{k o c{w ckyo

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    eflefphopf km hdwkp q{k {m pkcbdf km pk~f{uf lf uduxkmo U mopeo f dlxkpyocf hk

    xkm~f x>, Kuuku f`ukpyohfpku ~fhkm xom`m iowkp mkhdhou hf dlxkpyocf hk xkm~f

    q{k o c{w ckyo ~opo efm~ckxop kuuk xpogkxf {uolhf uk{u ~p~pdfu pkcbdfu,

    Fu f`ukpyohfpku hf uduxkmo U ~fhkm mkhdp f xkm~f q{k o c{w ckyo ~opo dp ho

    fpdbkm F hk U ox f ku~kcjf k yfcxop# {uolhf {m pkcbdf km pk~f{uf km U, Kcku f

    iopf ~fp mkdf hk {m eflg{lxf hk pkcbdfu km pk~f{uf k udlepfldwohfu km U#

    ku~ocjohfu ~fp xfhfu fu ~flxfu hk uk{ uduxkmo dlkpedoc,

    Of ckp q{ocq{kp {m hfu pkcbdfu hk U kuxomfu ekpxfu hk q{k xfhfu fu pkcbdfuhk U o~pkuklxom o mkumo ckdx{po, Ckmfu f pkcbdf P? hk U q{olhf o c{w k kmdxdho

    ho fpdbkm F hk U k f pkcbdf P0 hk U q{olhf f ~{cuf hk c{w pkxfplo o fpdbkm F, F

    dlxkpyocf hk xkm~f hkh{wdhf hkuuou ckdx{pou x, Lo Idb, ?? ykmfu {m eouf km

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    db{oc o 0#> u, Lf uduxkmo dlkpedoc U f ~kpfhf hf pkcbdf hk 0#5 u, Ykgomfu efmf

    duuf ~fuuykc,

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    Efmf o c{w ~pf~obo-uk efm ykcfedhohk e

    km xfhfu fu uduxkmou dlkpedodu ~pkeduf

    o~klou hkuef`pdp q{oc f ~kpe{puf ~kpefppdhf

    ~kco c{w ukb{lhf fu f`ukpyohfpku hk U, Km U

    f o~opoxf mfyk-uk {mo hduxledo y x&0 ~opo o

    hdpkdxo klxpk o kmduuf ho c{w k u{o pkickzflf ku~kcjf, Hod ox u{o yfcxo o fpdbkm Fhk U

    f o~opoxf mfyk-uk modu y x&0 ~opo o hdpkdxo,

    O udx{of kuxpdxomklxk kq{dyocklxk

    oq{kco kleflxpoho lo olcduk hf kz~kpdmklxf hk Mdejkcufl - Mfpckt *ukf 5,?$ k

    o hduxledo ~kpefppdho ~kco c{w km U

    F ~kpfhf hk xkm~f x oxpd`{hf of pkcbdf km mfydmklxf ~kcfu f`ukpyohfpku

    hk U ~fhk ukp kleflxpohf o ~opxdp hk

    F pkcbdf km pk~f{uf km U ~opkekp# ~opo f`ukpyohfpku km U# efppkp modu

    cklxomklxk hf q{k fu pkcbdfu hk U ~fdu f xkm~f x> mopeohf ~fp kck mklfp hf q{k

    f xkm~f x mopeohf ~kcfu pkcbdfu hk U',

    Fu f`ukpyohfpku hk U dlxkp~pkxom x{hf hk

    mfhf hdikpklxk, Ukb{lhf kcku fu pkcbdfu hk U

    kuxoyom ifpo hk udlepfldo *Idb, ?0$ k# ~fpxolxf#

    modu hf q{k lox{poc q{k ou mkhdhou ikdxou

    ~kcfu f`ukpyohfpku hk U kuxkgom km hkuoefphfefm u{ou ~p~pdou mkhdhou, _{olhf o c{w ifd

    kmdxdho ~kcf pkcbdf hk c{w f pkcbdf P0 hk U#

    pku~fluykc ~fp mopeop f xkm~f hk pkxfplf ho

    c{w o fpdbkm F hk U# g mopeoyo >#9: u,

    ' [m kz~kpdmklxf hdykpxdhf QG, E, Joikck# P, K, Akoxdlb# Uedklek ?22# ?99 *?420$] ckyf{ hfdu pkcbdfu oxmdefu hk Eudf kmyfu of pkhfp hf m{lhf, Fu pku{cxohfu efppdbdhfu ~opo hkueflxop kikdxfu ho pfxof ho Xkppo k ho pkcoxdydhohk bkpoc kuxfkm eflefphledo efm ou ~pkyduku hk hdcoxof xkm~fpoc ho pkcoxdydhohk pkuxpdxo, Yfop ukm~pk ~opo f ckuxk pkxopho fklykcjkedmklxf km ;4 lu ~fp yfcxo,

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  • 8/4/2019 15-relatividade-restrita-usp

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    8,2 O CFLBO YDHO HF MUFL

    _{olhf podfu eumdefu kuukledocmklxk ~pxflu hk ocxuudmo klkpbdo

    ejkbom o ocxo oxmfuikpo xkppkuxpk epdom-uk fu ejomohfu ej{ykdpfu eumdefu,

    Bpolhk ~opxk hou ~opxe{cou lfu ej{ykdpfu eumdefu uf muflu *~flu$#

    ~opxe{cou dluxykdu q{k hkeokm km f{xpou ~opxe{cou ejomohou muflu *mdflu

    f{ m{flu$, Fu muflu # xom`m uf dluxykdu k hkeokm ukb{dlhf o ckd hk

    hkeodmklxf pohdfoxdyf# L*x$ = L> kz~*-x cl0&x?&0$# uklhf L> k L f lmkpf hk muflu

    lf xkm~f hk u{o ~pfh{f k lf xkm~f x# pku~kexdyomklxk, O efluxolxk x?&0 o mkdo-

    ydho hf mufl # f{ ukgo# f xkm~f lkekuupdf ~opo q{k o ~f~{cof hk muflu

    ukgo pkh{wdho ~kco mkxohk, Lf uduxkmo hk pk~f{uf hfu muflu u{o mkdo-ydho hk

    5#? z ?> -9 u,

    Uk mflxopmfu hkxkexfpku hk muflu lf xf~f hk {mo mflxoljo hk ;#> am

    hk ocx{po k eflxopmfu f lmkpf hk muflu q{k ydogom efm ykcfedhohk y = >#4: e

    f`xkpkmfu {m lmkpf efmf ?>9 muflu km {m ekpxf dlxkpyocf hk xkm~f, Lkuuo

    ykcfedhohk fu muflu hkykpdom ckyop c #2z?> -;u *~pkyduf lf - pkcoxdyuxdeo$ ~opo

    ejkbop of lykc hf mop k o~klou 0#0z?> 8 muflu hkykpdom ukp hkxkexohfu co,

    Xfhoydo# f kz~kpdmklxf mfuxpo q{k 8#2z?>; muflu uf hkxkexohfu of lykc hf

    mop *0? ykwku modu hf q{k u{bkpk o ~pkyduf lf-pkcoxdyuxdeo$1 o mkdo-ydho hf

    mufl ~opkek ukp hk c#9z ?>-; u *; ykwku modu cflbo hf q{k km pk~f{uf$,

    F xpoxomklxf pkcoxdyuxdef mfuxpo q{k# lf uduxkmo hk pk~f{uf hf mufl oydobkm lf h{po x=?#2z?> - ;u mou udm x> = Ox& = 5#8z ?>-9 u *y = >#4:e =< =

    ;$, ^fpxolxf# 8#2 z?>; muflu hkykm uf`pkydykp o ydobkm, O hdcoxof xkm~fpoc

    kuukledoc ~opo klxklhkp o o~opklxk ydho cflbo hf mufl ,

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    o ~opxe{co, ^opo kck# k ~opo f mufl # o hduxledo hf xf~f ho mflxoljo ox fu

    hkxkexfpku of lykc hf mop lf ukp C> = ;#> am mou o~klou C = C>& = ?#> am

    *~opo f mufl o Xkppo yod o uk{ kleflxpf o ykcfedhohk hk >#4: e$, O Xkppo#

    ukb{lhf f mufl # dlxkpek~xo f ikdzk hk muflu km o~klou ?#> am & >#4: e = 5#8z

    ?>-9 u, ^fpxolxf# 8#2z ?>; muflu hkykm uf`pkydykp ydobkm,

    O ydho hf mufl {m `fm kzkm~cf ho pkocdhohk ho hdcoxof xkm~fpoc' k ho

    eflxpof hf efm~pdmklxf7 lf uf xp{q{ku ikdxfu efm ku~kcjf k {m ~f{ef hk

    dc{mdlof ohkq{oho, O olcduk# ikdxo km hfdu uduxkmou dlkpedodu hduxdlxfu# mfuxpo q{k

    km {m hkuuku uduxkmou f iklmklf efluduxk km muflu mfyklhf-uk efm

    ocxuudmo ykcfedhohk k ufipklhf o hdcoxof xkm~fpoc klq{olxf lf f{xpf uduxkmo

    ' F`ukpyoku hk e{pyou hk c{w hk u{~kplfyou ykcfeedmou hf xd~f Do uf f{xpf `fm kzkm~cf, F mzdmf hk c{mdlfudhohkhou u{~kplfyou Do ykcfwku oxpouo ypdfu hdou *ukm~pk km oefphf efm o pkcoxdydhohk$ km pkcof o u{ou ukmkcjolxku kmpk~f{uf km pkcof Xkppo, Q@, Ckd`{lhb{x kx oc,# Ouxpf~jtu, G, 899 C0? *?449$,]

    09

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    ~opo ukp pkek`dhf lo fpdbkm F hk U, ^fpxolxf# f dlxkpyocf hk xkm~f klxpk o

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    ; em&u *B,P, Duooa# ^jtu, @{cc, 0?# 0;; *?42>$$, F kikdxf Hf~~ckp xom`m

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    eopoexkpuxdeo hk eoho cdljo mklfp hf q{k o ipkqledo ho mkumo cdljo lo Xkppo$#

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    8,?> ^OPOHFZF HO EFLXPOF HF EFM^PDMKLXF6

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    ^opo kydxop q{ocq{kp dlecdlof ho `oppo km pkcof o mkuo f oco~f u

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    ukb{k {mo xpogkxpdo ~opo`cdeo k o `oppo hkifpmoho# ukb{lhf fu f`ukpyohfpkuhk U, ^opo fu f`ukpyohfpku hk U o `oppo udm~ckumklxk eod# of cflbf hk {mo

    ~op`fco# ukm ukp hkifpmoho, Pdbdhkw lf {mo lff dlhk~klhklxk hf uduxkmo

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    Modu hkxocjku ~fhkm ukp kleflxpohfu km R, Pdlhckp#Om, G, jtu, 04# 59; *?49?$,

    ' ^opo kleflxpop ou kq{oku *8,8>$ ckm`pk q{k t = t k q{k x = *y$ *x! yz & e0$, Kleflxpop f kq{dyocklxk km U houeflhdku x 3 > k x > modu efm~cdeohf7 u{`uxdx{o z = *y$ *z ! yx$ km x = *y$ *x - yz & e0$ ~opo kleflxpopx *? ! 0 y0&e0$ = x - 0 yz&e01 lf hdiedc mfuxpop q{k ? ! 0 y0 &e0 = 0 k q{k# ~fpxolxf# x = x & - yz & e0, Cfbf#x & = x ! yz&e0 k uk x 3 > klxf x 3 -yz&e0 k uk x > klxf x -yz&e0,

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    8,?? ^OPOHFZF HFU BMKFU6

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    ~kpmolkek{ lo kuxof,

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    q{k f dlxkpyocf hk xkm~f mkhdhf oq{d# lo ku~ofloyk, _{olhf fu bmkfu uk

    pkkleflxpopkm oq{kck q{k idef{ lo kuxof ku~oedoc hkykp ukp mklfu ykcjf hf q{k f

    bmkf ho ku~ofloyk, _{km kux efm o powf6

    Om`fu fu bmkfu ~opkekm xkp {uohf {m poedfeldf pkcoxdyduxdeomklxk efppkxf#

    cololhf mf hf ^pdle~df ho Pkcoxdydhohk k ho hdcoxof hf xkm~f mou f`xklhf

    pku{cxohfu dlefm~oxykdu7 ~opohfzf6 Lf/

    J {m ~kq{klf kppf lf poedfeldf hf bmkf ho ku~ofloyk, ^opo ~fhkp

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    klxpk uduxkmou dlkpedodu,

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    [m hkxocjk dm~fpxolxk, O~klou o effphkloho ku~oedoc of cflbf ho hdpkf ho

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    hdcoxof hf xkm~f k o efluxledo ho ykcfedhohk ho c{w,

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  • 8/4/2019 15-relatividade-restrita-usp

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    *pkcoedflo